This was really cool! I'll repeat the small window comments made below but in general I really liked what you were going for with the style. It did take me a second to work out how to get the starting room with the stairs though. The thing I liked most were the core combat mechanics, the roll and the need to reload together with how the shooting felt have a lot of potential to explore more deliberate gameplay that rewards the players mastery of the mechanics. With different weapons that put spins on that I think it could lead to some really interesting stuff. Cool entry, well done!